When you are working on your unit, make sure that only one (1) program is running. The Hunter units can have 3 programs (a, b, and c). I know of a case where a friend had all three programs running, and was watering the lawn multiple times per week. It appears the prior owner or landscapers had reprogrammed the until using an new program instead of the original, and did not turn off the old one.
Jim Baumgartner is excellent 352-504-2317, he found the above problem at the friends house. he has also worked at my house twice, the last time to look for a leak, found a bad sprinkler head and tuned the system.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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